subject: Sports Ferrari 612 Scaglietti | Sports Car Racing [print this page] n particular, systems such as the Global Positioning System (GPS), that use constellations of earth-orbiting satellites, are affected by space weather phenomena. In principle, the GPS uses known positions of satellites and their distances from a receiver to determine the location of the receiver. These weather satellites are also used to inform us about the seasonal weather patterns and if there is any changes detected.links london
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A GPS receiver uses radio signals from several orbiting satellites to determine the range, or distance, from each satellite, and determines from these ranges the actual position of the receiver. The radio signals must pass through the ionosphere and in so doing they are subjected to variations in the electron density structure of the ionosphere. Changes in the electron density due to space weather activity can change the speed at which the radio waves travel, introducing a "propagation delay" in the GPS signal.
The propagation delay can vary from minute to minute, and such intervals of rapid change can last for several hours, especially in the polar and auroral regions. Changing propagation delays cause errors in the determination of the range, or "range errors". One of the newer ways of get weather updates for our locality is from gps receivers. As these receivers take their information directly from gps satellites the owners will be able to see how the weather is well in advance.
This knowledge about the weather is very useful to know if you are going out hiking, golfing, or even traveling in foreign countries. The information that is taken from weather satellites can be used by scientists and other professional who require this data. Currently to help the Meteorology department access more information and predict certain weather patterns there are specialized satellites that have been made.links of london
Another GPS technique uses Carrier Phase Tracking. In this technique, the phases of individual cycles of the carrier waves are compared. However, if the electron density along a signal path from a satellite to a receiver changes very rapidly, as a result of space weather disturbances, the resulting rapid change in the phase of the radio wave may cause difficulties for the GPS receiver, in the form of "loss of lock". Temporary loss of lock results in "cycle slip", a discontinuity in the phase of the signal. Very rapid variations (less than about 15 seconds) in the signal's strength and phase are known as "ionospheric scintillations" .
